body {
  margin: 0;
  background-color: yellowgreen;
}

.red {
  background-color: red;
}
body {
  margin: 0;
  background-color: yellowgreen;
  color: #333;
}

.red {
  background-color: red;
}

.black {
  background-color: black;
  color: #fff;
}

.green {
  background-color: green;
}

.white {
  background-color: white;
}
.black {
  background-color: black;
}

.green {
  background-color: green;
}

.white {
  background-color: white;
}